Free betting tools
Accurate calculators and converters the pros use, completely free, running right in your browser.
Bet Calculator
Stake × odds → returns & profit
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Odds Converter
Decimal ↔ fractional ↔ American ↔ probability
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Accumulator Calculator
Up to 12 legs — combined odds & returns
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Margin Calculator
Bookmaker margin (vig) for 1X2 & 2-way
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Kelly Criterion Calculator
Optimal stake size from your edge
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Surebet Calculator
Arbitrage check & stake split (2–3 way)
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Premium
Value Bet Finder
Your bookmaker odds vs our model — where is the value?
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Poisson Score Predictor
Expected goals → scoreline probabilities
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Disclaimer: We do not promote or encourage betting in any way. These tools are for purely educational and analytical purposes, to understand the math behind the numbers. 18+, and play responsibly: if the fun stops, stop.
Why these tools?
Every tool here answers a real question bettors search for daily: how much will my bet return? What does this price mean? Is there a guaranteed edge in these odds? What is my optimal stake? The tools run entirely in your browser, no signup, using the same math as our prediction engine.